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Simplifying -87 = 7x + -3(4x + 14) Reorder the terms: -87 = 7x + -3(14 + 4x) -87 = 7x + (14 * -3 + 4x * -3) -87 = 7x + (-42 + -12x) Reorder the terms: -87 = -42 + 7x + -12x Combine like terms: 7x + -12x = -5x -87 = -42 + -5x Solving -87 = -42 + -5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '5x' to each side of the equation. -87 + 5x = -42 + -5x + 5x Combine like terms: -5x + 5x = 0 -87 + 5x = -42 + 0 -87 + 5x = -42 Add '87' to each side of the equation. -87 + 87 + 5x = -42 + 87 Combine like terms: -87 + 87 = 0 0 + 5x = -42 + 87 5x = -42 + 87 Combine like terms: -42 + 87 = 45 5x = 45 Divide each side by '5'. x = 9 Simplifying x = 9
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